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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5adf7e94577a7169ed4b52e6fa892385dd3b5ed7aa0f6aa80a1d73513e0afede' 
  AND token = '4IxrhvhXjas26G7IFoh+iX+/IwjalJri0DiUnB7jazk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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