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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '047d1a382f5d9fbff1b81f9520635e8111efa1dfac0d1df81ac7ec9e6ad0c67a' 
  AND token = 'UjSK5nWB1ybzmSDDfYc1N/AHMSYt9W6/c3FXM50PHQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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