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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0193cf817435cde9e740b491f50a6b6845e7ccdd16a0b2d12bb698977e64664e' 
  AND token = '0/Y6Fjy4Yp3BE7siHB5aT30u3d+K+L16+TXYoXfllPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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