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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8255e096e822ecb906bde62edea2a76e343a5a096fd97ff80590c805ef5feed5' 
  AND token = 'icGxqAFvkbw8XAqJ+otFJ0tvRQbb7DGHayPjZ2l0uBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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