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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b8b069a13f68bdd3952ed37b1f98b567fb69b8aad947e88884e23888a427295' 
  AND token = 'm+rKqU/MW6r4CYlHoQOgikgdDm3y4gOAaeypkaf8zM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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