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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a12e7ba9894ccd7928bcb08710301784c48ff026362b2bd75f7b368de9153a91' 
  AND token = '5C4MJAni3XXfQ5Mfn9NgCbhg26w6FPJ2ra89Ar4u4eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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