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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2b7ab1bf8a94623947b5d53c94ad143027bfc89f94e853de6df148e2e5bf9e1' 
  AND token = 'Cd1qZkakUVL55WC6+T4n7Codf8gdpdi4MQvXmO7UFiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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