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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1931b0c055c71c7be6955745ed6cc26aedc415ea206ec136b268b814ad558a4b' 
  AND token = 'On9+i/UwXpaPWmg0QzE+1buoaxlZaB99kNdekzv8Pjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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