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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '555dae1c2f20b2710bc5218ebab4b2d112724fa5ab5380233ea95b15ce452a62' 
  AND token = 'nJVhr5jIR7YHyIeHtudPQ98Up+xy5dlx5V2K+vSJloo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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