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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f70fed6fa8b9a8d9f5cf5d9f8059297167190c0fd2bd7d253ec0e6bab2b3f07' 
  AND token = 'efSTEiYoxzk8HrVmji51AxizIhOaH3ZA07/O8EYZfMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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