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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4447232160843144a3e70af38fd147c96d3d077fe9d4c483ee6a7d5a84b67354' 
  AND token = 'Eb+C0ccNe5fh+2HBh7CxYOzvXnqO2gmKfape4/AW3d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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