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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d5da56376e698bcd490eb8376eb14a0094e8c45c88af64fa1bfe374422debd6' 
  AND token = 't4qw0BZgm768pDaSb42o4/FPE4RNp94WE4nA5Ah5+/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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