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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38aa0bdef6996291369ecbebe0199ab0d29f125e6b2728b6a783c6ed6ae2418c' 
  AND token = 'kXLizXOabC4L7UQsltxFsIFEBaMKIVEl+OOJiRbmJFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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