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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12d66ad64098f6b7963f431400a5ba8b8b40de29950c84e33aa0f32dd38e8d8c' 
  AND token = '+6QF17sgYwZiEjYnexOm1f7mkFy+b5+JggrpxZwA3uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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