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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f1a316e1222b4de8da0bce04a20a204e7f0b1308d0e5dc270b36a0f8f31a7c8' 
  AND token = 'xn3QCfaPxTPfCd6M96lCGOO/iaABz1+Vg88M4Op/wlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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