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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f87e36278fac4095c1c5a5750be1afb609cb259def8ca06f7ba046697e2f84dd' 
  AND token = 'L0ycd3mLQnWLTeRDf4Nw//DsC6LZmmotdv7w14txqKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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