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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '94adfc88cdd1891ac501138769988d4e4e3b51ee3c19daa26617859cf383963f' 
  AND token = 'RHONZ1yWK2MzMHB22T0n0QVJ4F1FZpiorKxFMJEB2sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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