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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7763fdea554e13c226129b4470b51ab9bfa0e81f28962ac30e361e74dc03720' 
  AND token = 'uGnH5xRovUS4QeCS0AmcimwL52WUlsLnKu7LPrka6D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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