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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '91ab7630f6ee254ef7a95cb4783c3c1bc9098301a13495a0a7c97425de3cd107' 
  AND token = 'VicLasxYCWfN2kyCV2uMsSbKAwvuYms973/Un5Ea89Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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