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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7597592d3470e92c4d316c4aa644ea38a2fb7a7707c92b75ddc6ebe549b75cb' 
  AND token = 'j3QayvIsytGlNMxLx6fjbI+lRoYMFdLqKHBrNnqa6M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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