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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1388b4877023c020f43fe06d32003cd991fa1c5d2d32b283d91a46ac2238feb0' 
  AND token = '0el9Ss89dOtwLPPMk3Vp9g4W/OliKdP4+LNaUdkMwsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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