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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30d116d38b1a0207cf919adcd1d3673a15b9c9c1406f4dd102d115fe3fc9620e' 
  AND token = 'Rh3pG4FstyBIrfR2/yrmnHnptuJJU5KZnkJQP2JQ5vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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