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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4289689f186efe8bec14095fed3bffeb1b50490d4eb0b33e5e520ec383adbf31' 
  AND token = 'PfhmM1USbzrirKrEtGaER7NxbxZDo+m5dc/ylX4/e4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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