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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1bc4ec51ac9ac19969d0f2c726690f4ee06982c854688bdeb347fdc7717080a1' 
  AND token = 'Pm8qvl99RZhlUdkDS7MQ4QoL/ckWnilrOagY/goOFaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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