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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf264f52b7942eca447134c2650389904e046a1e54cc1dc86b5541f57064fb8e' 
  AND token = 'yiiswBy+tufs3gH4gb5aw+N7vBH89HIsIKLJJQeGAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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