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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7dc4b4791afd0d0ae158a8da840ee14d0464655691268c49c91a96bce1dd8d75' 
  AND token = 'idWsbvLHfumPoFhEp7DCWESLM9NW//mDiAtpr493zYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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