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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d5da364f1e47ec8b3fa210db24f3136801ccad2eb1459b3c131e7bbe66257d4' 
  AND token = 'F+OHmaRoyFNdZ8DBAjiR7sBtgPlFyd0n9xd0JBOhTrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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