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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a566e962b888e76505814c1235f5ae24887fa911eb49eccaa21c6b2e6401e8d5' 
  AND token = '1JflNIl+fVpaVAeKLLWC5HvvEbi0/V8jJmDMI5KqnZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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