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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '090693d3882d69c78b804425c1e7c9c311781671e92cd71222c0dd3170daeb32' 
  AND token = 'aRnBrt39hk5YPZ7LtR7XPEHHQ1nPdImFYK0CaHAOHNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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