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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c7fe1c6cf88678409bf0a85a9688f2d25a13bbd8aa6383b7ef7b09c9f23a54cc' 
  AND token = 'fyn0SZ2jgrDFLOSnIwBr6zayyRl6Il6xcFO7EbdxWx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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