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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bd527fe47d5ddd858d1539999f44eaeff4ec5a5117c22d0406f47c36db3964b' 
  AND token = '+lQDO9f0JnTQkJ3Pxsz+UifGuo59pXLoxLY+tBfo49A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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