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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '941146876e31411a56f5a48d6347641b32d7614088ceee5928a5e5d835e9e112' 
  AND token = 'K7ZNZFJstgZ0PfjT9UumgC1odw9QgULUKix+XPnScbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}