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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c96da12615ca773d2a6e53a18dcc650e0a3c2c2637e7eea9b35d1e0bc803afcd' 
  AND token = '6JX+TIijf81wDHpNVVmU2xdhawWcIUM5+GGMm05BmCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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