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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e560bf8a40c191840dec3a17fd51fa0a5beedccd73a2a7e03b8b10cb14da6adf' 
  AND token = 't0H50KX9p16rzBKBcIc3udlSE5lIGDngHkyT6k8FGv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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