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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a1989d3de1033f5e99ff8bdd44bb2b42fa2841001ce2c303c67eadd21d19c3e' 
  AND token = 'OEuhLE6BqhfCa9VoSuf04GUn/bNqCHkblG6zzjmS7uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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