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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd272f6e9a40e0c80d3f24da054eed959d4774df28ead78a84146998ec2b059da' 
  AND token = 'eN7u2r9ugzY40pzgMRyVeEAvg+2YjjK3qnpK6dxq4L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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