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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6327aaa7b8585e64c26c3a2d68617b3f053b13e635ddfa806015e8c74bf06d91' 
  AND token = 'nFjZ7i0XsDFPaxSSNOjHCm9iLsRbWUI7HecGHtpVBSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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