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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7be932036e68bd0b55cbb8f36eab1aa6f0daced60b6c76c329337a885ef69f7' 
  AND token = 'bpfoPYCOAvhn5jCzBtqYclMtWAlixP7SkpNV9RS84h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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