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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa58b1b75e2eb44d88683262fedd88c75db05d3a720239501cbd342a8a9d6904' 
  AND token = 'slSp+Wibhsbo5BfEv93O6JHvniG4A+uKg4yen30tXsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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