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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cc986549f06a295e7750acafaa328c373c50100aafc5931d263c18b5465222e' 
  AND token = '5T+HnvjDvshUPI9eWKEQaXnqQCqJEe+p+myVPkq71P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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