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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0805604a1b82751d642ba40e7832907c1669b9f8724319552556d9c34f0ac1e' 
  AND token = 'Tq8t+bZ3oNB80CFCNfh47BtkSFLH8i5+x/ho+5pSA+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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