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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '877990891785c90e5a1cfa459b8dd8d3b94705c787dc73af526894b159f30004' 
  AND token = '2OuQnjGy+DjyyrQn4aITQxpfkJuyiNw/2w7xpPRawY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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