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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d3676b829fe6ef15cd9ee60c5027c3f26a38808c6ebd2429382dd29d30276d9' 
  AND token = 'Gu6B7S9ESxK8uVjZpAKvLYi22151YLi67iy/UGf6QSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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