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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b4494a94fe877381dc0b4bd739d57bbadc3f5e9afab44a7da285911632da941e' 
  AND token = 'aIRcZVXFSW6VU2yN/CuI/WLcMvbPOv5H+5bk7GzmZHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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