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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a7ecd7600f67c697e54c7598206631fcef8d0033a6150b061b27bc3148236b2a' 
  AND token = 'Z72FOI4P6wjSgv14yze1qaf6wepNWW2EVk8Ms1NOH4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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