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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'efce953fe52a8ee68fb9d529074370fdb99a24ca854e1e59a1b4ef0050e1224e' 
  AND token = 'okRCX+jNTG9QxzNMiSyblkZyGFMBiRlYREpk3WogFG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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