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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4ce8a90408ce00334baa1a97a915f2dd4454e4e7e5a1eaf1ced3fd285fe0e941' 
  AND token = '9Vh2MjLZCLztmVX4Nma4W1hpHcbNq1s2kUtFtzR4BWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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