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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '76bafc08284ea2943ddf34ebf41ca71e41512c4633d00300184e81a3b3c4f664' 
  AND token = '4SsW/X04i+yvg7Jt9lk9n1LzryOxVJ27dfCAkNha7Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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