SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba92311d6b723577a86f68a2003a1f8dc83ece62a459fa02df9a8d0b5829f3f8' 
  AND token = 'P4w1Iigp6qWtijl8yPzEuprqFAqOX1e81cq/zKhBwDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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