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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f55fca61f4d64331e3125cc8badffa173ae5b2848675ac164c10ed16a538219' 
  AND token = 'mFQOwQOD66tm/ltGJlTEetLvCOD8r0llgIU6hTCz/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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