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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4dc0f011a5203f6ebd8450e8c937118778ce214983a271774ed31578b48dc7c1' 
  AND token = 'xzz2CocIJbtDTspkH5U/RTKueeNxbr944BDKnR1Rx1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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