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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7316296ba4e93bcb85c51e4c452baaa25913b5fa49febfbce3ea00f9ccbbb41e' 
  AND token = 'AJ2R0TK6OOuRXuswpomFZpYmb7HOt2GNdzTGU188gHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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